| Issue |
109311
|
| Summary |
Clang should not warn about =delete("reason") in C++17 mode while claiming to support it
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
dangelog
|
Clang 19 seems to define `__cpp_deleted_function` even in pre-C++26 modes. However using it results in a warning:
```
void f() = delete
#if __cpp_deleted_function >= 202403L
("reason")
#endif
;
```
```
<source>:3:6: warning: '= delete' with a message is a C++2c extension [-Wc++26-extensions]
3 | ("reason")
| ^~~~~~~~
1 warning generated.
Compiler returned: 0
```
https://godbolt.org/z/Esqh5aPfb
It sounds a bit strange to claim support for a given language feature (by setting the corresponding feature-define macro), but then warn if that feature is used? Would it be possible, in pre-C++26 modes, to support the syntax and warn but _not_ set the macro?
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